VMM/password: Post-2to3 fixes. Replaced ….encode('hex') and ….encode('base64') by b64encode(…) and b2a_hex(…). Added some necessary encode() and decode() calls. Fixed NTLM hash generating with non ASCII characters.

.. |curr_vers_rel_date| replace:: The most current version of vmm is 0.6.1,
 released on 03 October 2012.
.. |rel_hist| replace:: Older releases are listed in the :doc:`release_history`.